Summary: doesn't merged mining provide a path for an altcoin to steal bitcoin's network power and market cap, with little investment, even without any change to the BTC protocol and without any special mechanism to "transfer" BTC to it?
Could some sidechains innovation provide suitable incentives to miners that would prevent this risk?
That'd be a great invention.
By "that" you mean the GNC coin, or a way to protect BTC from having its network stolen via merged mining?
As fas as I can see, such a "bitcoin killer" coin would not need to invent anything, correct?